November 30, 2015

Homework Help: chem--buffers

Posted by Rav on Sunday, March 7, 2010 at 5:02pm.

Calculate [H30+] in a solution that is 0.0525M HCl and 0.768M NaC2H3O2. Ka(HC2H3O2)= 1.8 x10^-5.

the way i did it is that i used the given molar of HCl to find the moles of Hydronium in the acid, and then i used that to find the moles of OH- in it, using kw. then thru the equation:

C2H3O2^- + H2O <==> HC2H3O2 + OH^-

and thru ice tables used the mols of OH- as initial and solved for x, then got OH- final, and finally found H3O+......this seems to be a way longer way the way i did it...i am sure ther's an easier way to do this...and this might also be wrong. how to do this?

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